I just finished my 2nd interview on monday. Now, the waiting begins, and June 1st seems quite a ways to go.
@nominomi, here are my interview tips. Practice out loud answer to the common questions like "why Mba", "why Insead" until you can answer them in your sleep. Then analyse the 4 criterias Insead is looking for and how they pertain to your profile (Leadership potential and work experience, Academic capacity, International motivation, and Ability to Contribute). If you think your application form might show you are weak in one of those areas, practice how to defend your case, in case the interviewer asks about it.
I was quite lucky as my interviewers were really friendly and open. They did ask me work/motivation related questions, but it felt more like a chat with a new acquaintance that wanted to know more about you, then a formal interview.
Good luck!!